The outcome of November's vote on a proposed constitutional amendment to define marriage as the union of a man and woman is a "tossup," according to a new poll out Wednesday, Sept. 12.

Public Policy Polling found 48 percent of likely voters in favor of the amendment, 47 percent opposed and 5 percent not sure.

A January survey by the North Carolina-based polling organization found slight support for the amendment (48 percent to 44 percent), but another in June found 49 percent to 43 percent opposed.

A poll released Tuesday by a different polling organization, Survey USA, in conjunction with KSTP-TV, found stronger support among likely voters for the marriage amendment. In that poll, 50 percent of Minnesotans were in favor, 43 percent opposed and 8 percent undecided.

In both of the recent polls, support for the other proposed constitutional amendment on the fall ballot -- which would require voters to present a photo ID at the polls -- was strong.

Voter ID leads 56 percent to 39 percent in the latest Public Policy Polling poll, with 5 percent not sure. That's a closer race than in a June poll from PPP that found voter ID was favored 58 percent to 34 percent. The Survey USA/KSTP poll had it at 62 percent to 31 percent in favor, with 7 percent undecided.

Public Policy Polling surveyed 824 likely Minnesota voters Monday and Tuesday. The margin of error for the overall survey is plus or minus 3.4 percent. The surveys were conducted through automated telephone interviews and were not paid for by any candidate or party.

PPP is a firm that conducts surveys primarily for Democrats.

The Survey USA/KSTP poll was of 551 likely voters and has a margin of error of plus or minus 4.3 percent. Participants were interviewed on their home phones or cellphones Sept. 6 through Sunday.

The PPP poll found women, Democrats and voters younger than age 45 tend to oppose the marriage amendment, while men, Republicans, independents and seniors support it.

Minnesotans do support providing gay couples with some form of legal rights. The PPP poll found 72 percent support either marriage or civil unions, compared with 25 percent opposed to any legal recognition of gay couples.

Support for photo ID breaks strongly along party lines as well, with Democrats opposed and Republicans and independents in favor.

PPP asked some non-amendment-related questions as well.

It found voters seem satisfied with Gov. Mark Dayton -- 48 percent approve of the job he's doing, compared with 37 percent who disapprove. Dayton would lead a generic Republican for re-election 51 percent to 38 percent.

Democratic U.S. Sen. Al Franken has a 49 percent to 42 percent approval rating, and he would be projected to win hypothetical contests against Republicans Norm Coleman, Tim Pawlenty or Michele Bachmann.